EZ style $150 This one you can keep your original detal ring. and A2 frontsight . All you need is to remove your midlength handguard to install this in.
http://i81.photobucket.com/albums/j206/vietboy1st/P1020248_zpshnnnxfko.jpg (http://s81.photobucket.com/user/vietboy1st/media/P1020248_zpshnnnxfko.jpg.html)
http://i81.photobucket.com/albums/j206/vietboy1st/P1020249_zpss9ewutbk.jpg (http://s81.photobucket.com/user/vietboy1st/media/P1020249_zpss9ewutbk.jpg.html)
http://i81.photobucket.com/albums/j206/vietboy1st/P1020250_zpsszkr7ult.jpg (http://s81.photobucket.com/user/vietboy1st/media/P1020250_zpsszkr7ult.jpg.html)
http://i81.photobucket.com/albums/j206/vietboy1st/P1020251_zpsogx4br2f.jpg (http://s81.photobucket.com/user/vietboy1st/media/P1020251_zpsogx4br2f.jpg.html)